Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9782819 | Spiral spring manufacturing method | Ryuji Kishihara, Naoya Wada | 2017-10-10 |
| 9400026 | Spiral spring | Ryuji Kishihara, Naoya Wada, Akio Kidooka, Yuu Yokoyama, Akira Hori | 2016-07-26 |
| 7556011 | Valve structure for internal combustion | Ryuji Kishihara, Tadashi Saito, Takao Suzuki, Futoshi Fujiwara | 2009-07-07 |
| 6790294 | Spring with excellent fatigue endurance property and surface treatment method for producing the spring | Masaaki Ishida, Kazuhiro Uzumaki, Yuji Isono, Yoshiro Yamada, Hiroshi Suzuki +1 more | 2004-09-14 |
| 6223574 | Thin-walled ring-shaped member and method of manufacturing same | Kazuo Kataoka | 2001-05-01 |